Thorough explanation of the differences between CSIRT and PSIRT|Summary of roles, scope of response, and necessity

**1. What is CSIRT? **

The Computer Security Incident Response Team (CSIRT) is a
This is a specialized team that responds to "information security incidents within the company and the entire organization".

Key Roles:

• Respond to cyberattacks, malware infections, etc.
• Monitor threats to internal systems and networks
• Investigate the cause of an incident, identify the scope of impact, and respond to recovery
• Drawing attention to internal alerts and formulating measures to prevent recurrence

**2. What is PSIRT? **

The Product Security Incident Response Team (PSIRT) is a
This is a specialized team that responds to "vulnerabilities and security issues related to our products and services".

Key Roles:

• Responding to vulnerabilities found in our products (including zero-day)
• Respond to reports from security vendors and researchers
• Disclosure of CVE numbering and vulnerability information (issuance of advisories)
• Software patch provision and user notification

3. Summary of the differences between CSIRT and PSIRT

Coverage

• CSIRT: Overall internal infrastructure and information systems
• PSIRT: Products and services provided by the company

Main Responses

• CSIRT: Attack Detection, Containment, Recovery, and Recurrence Prevention
• PSIRT: Vulnerability analysis, fix, external disclosure, and customer notification

Involved

• CSIRT: Internal IT & Security Department, Employees
• PSIRT: Product Development, Support Team, Security Researcher

Timeline

• CSIRT: Real-time response with an emphasis on immediacy
• PSIRT: Reporting → Evaluation → Fixing → Publishing and Phased Response

Example guidelines

• CSIRT: NISC CSIRT Guidelines, FIRST
• PSIRT：ISO/IEC 30111、CVD（Coordinated Vulnerability Disclosure）

 

4. Common misconceptions and precautions

• It's not just about "one or the other"
  → Companies that develop products need to establish both CSIRT and PSIRT systems .
• "CSIRT also does PSIRT" is prone to inefficiency.
  → Since the technical areas and targets are different, the division of roles is important.

5. Summary: Divide roles correctly to build a strong security posture CSIRT is a team that "protects the organization"

• Focus on incident response and network monitoring

PSIRT is a team that "protects products"

• Focus on vulnerability response, information disclosure, and user response

Cooperation between the two is also important

• Collaboration is necessary because there are cases where product vulnerabilities cause internal damage.

Colorkrew also offers consultations on CSIRT support and operational improvement support.

"What do I need?" "Where do I start?" If you have any concerns, please feel free to contact us!